ISO 13165-3:2024

Water quality — Radium-226 — Part 3: Test method using coprecipitation and gamma-ray spectrometry

This document specifies a method to determine radium-226 (²²⁶Ra) activity concentration in all types of water by coprecipitation followed by gamma-ray spectrometry (see ISO 20042^[7]).

The method covers the measurement of soluble ²²⁶Ra activity concentrations greater than?0,002?Bq·l^-1 using a sample volume of up to 100?l of any water type.

For water samples with a volume of less than a volume of 1?l, direct gamma-ray spectrometry can be performed following ISO 10703 but with a higher detection limit. The typical detection limit for samples of 1?l to 5?l is in the range of 0,002 to 0,000?40?Bq·l^-1[8].

NOTE??????????? This test method can be adapted to determine other naturally occurring isotopes of radium, such as ²²³Ra, ²²⁴Ra and ²²⁸Ra, if the respective ingrowth periods are taken into account.

Edition	2024
Standard Part No	3
Published Date	2024
Published By	International Standardization Organisation
Page Count	15